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13 results on '"Shi, Yumeng"'

4. Synthesis and Transfer of Single-Layer Transition Metal Disulfides on Diverse Surfaces

Author

Lee, Yi-Hsien, primary, Yu, Lili, additional, Wang, Han, additional, Fang, Wenjing, additional, Ling, Xi, additional, Shi, Yumeng, additional, Lin, Cheng-Te, additional, Huang, Jing-Kai, additional, Chang, Mu-Tung, additional, Chang, Chia-Seng, additional, Dresselhaus, Mildred, additional, Palacios, Tomas, additional, Li, Lain-Jong, additional, and Kong, Jing, additional

Published
2013
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5. Integrated Circuits Based on Bilayer MoS2 Transistors

Author

Wang, Han, primary, Yu, Lili, additional, Lee, Yi-Hsien, additional, Shi, Yumeng, additional, Hsu, Allen, additional, Chin, Matthew L., additional, Li, Lain-Jong, additional, Dubey, Madan, additional, Kong, Jing, additional, and Palacios, Tomas, additional

Published
2012
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6. van der Waals Epitaxy of MoS2 Layers Using Graphene As Growth Templates

Author

Shi, Yumeng, primary, Zhou, Wu, additional, Lu, Ang-Yu, additional, Fang, Wenjing, additional, Lee, Yi-Hsien, additional, Hsu, Allen Long, additional, Kim, Soo Min, additional, Kim, Ki Kang, additional, Yang, Hui Ying, additional, Li, Lain-Jong, additional, Idrobo, Juan-Carlos, additional, and Kong, Jing, additional

Published
2012
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12. van der Waals Epitaxyof MoS2Layers UsingGraphene As Growth Templates.

Author

Shi, Yumeng, Zhou, Wu, Lu, Ang-Yu, Fang, Wenjing, Lee, Yi-Hsien, Hsu, Allen Long, Kim, Soo Min, Kim, Ki Kang, Yang, Hui Ying, Li, Lain-Jong, Idrobo, Juan-Carlos, and Kong, Jing

Subjects
*VAN der Waals forces, *EPITAXY, *MOLYBDENUM sulfides, *GRAPHENE, *ARSENIC, *CRYSTAL growth, *HETEROSTRUCTURES, *CHEMICAL templates
Abstract

We present a method for synthesizing MoS2/Graphenehybridheterostructures with a growth template of graphene-covered Cu foil.Compared to other recent reports,(1, 2) a much lowergrowth temperature of 400 °C is required for this procedure.The chemical vapor deposition of MoS2on the graphene surfacegives rise to single crystalline hexagonal flakes with a typical lateralsize ranging from several hundred nanometers to several micrometers.The precursor (ammonium thiomolybdate) together with solvent was transportedto graphene surface by a carrier gas at room temperature, which wasthen followed by post annealing. At an elevated temperature, the precursorself-assembles to form MoS2flakes epitaxially on the graphenesurface via thermal decomposition. With higher amount of precursordelivered onto the graphene surface, a continuous MoS2filmon graphene can be obtained. This simple chemical vapor depositionmethod provides a unique approach for the synthesis of graphene heterostructuresand surface functionalization of graphene. The synthesized two-dimensionalMoS2/Graphene hybrids possess great potential toward thedevelopment of new optical and electronic devices as well as a widevariety of newly synthesizable compounds for catalysts. [ABSTRACT FROM AUTHOR]

Published
2012
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13. Synthesis of monolayer hexagonal boron nitride on Cu foil using chemical vapor deposition.

Author

Kim KK, Hsu A, Jia X, Kim SM, Shi Y, Hofmann M, Nezich D, Rodriguez-Nieva JF, Dresselhaus M, Palacios T, and Kong J

Subjects
Gases chemistry, Macromolecular Substances chemistry, Materials Testing, Molecular Conformation, Particle Size, Surface Properties, Boron Compounds chemistry, Copper chemistry, Crystallization methods, Membranes, Artificial, Nanostructures chemistry, Nanostructures ultrastructure
Abstract

Hexagonal boron nitride (h-BN) is very attractive for many applications, particularly, as protective coating, dielectric layer/substrate, transparent membrane, or deep ultraviolet emitter. In this work, we carried out a detailed investigation of h-BN synthesis on Cu substrate using chemical vapor deposition (CVD) with two heating zones under low pressure (LP). Previous atmospheric pressure (AP) CVD syntheses were only able to obtain few layer h-BN without a good control on the number of layers. In contrast, under LPCVD growth, monolayer h-BN was synthesized and time-dependent growth was investigated. It was also observed that the morphology of the Cu surface affects the location and density of the h-BN nucleation. Ammonia borane is used as a BN precursor, which is easily accessible and more stable under ambient conditions than borazine. The h-BN films are characterized by atomic force microscopy, transmission electron microscopy, and electron energy loss spectroscopy analyses. Our results suggest that the growth here occurs via surface-mediated growth, which is similar to graphene growth on Cu under low pressure. These atomically thin layers are particularly attractive for use as atomic membranes or dielectric layers/substrates for graphene devices., (© 2011 American Chemical Society)

Published
2012
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